Fraunhofer's lines

Fraunhofer's lines

absorption bands or lines seen in a spectrum, caused by the absorption of groups of light rays in their passage through solids, liquids, or gases.
References in classic literature ?
Sir,--I have read with amusement, not wholly unmixed with some less complimentary emotion, the complacent and wholly fatuous letter of James Wilson MacPhail which has lately appeared in your columns upon the subject of the blurring of Fraunhofer's lines in the spectra both of the planets and of the fixed stars.
The general blurring and shifting of Fraunhofer's lines of the spectrum point, in my opinion, to a widespread cosmic change of a subtle and singular character.
If it pleases you to believe this rigmarole about ether and Fraunhofer's lines upon the spectrum, do so by all means, but do not ask one who is older and wiser than yourself to share in your folly.

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